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Fig. 5. Peak shift model for the evolution of the colour patch in male house
finches, following published descriptions
(Hill, 1993;
Hill, 1994b). The Michigan
population (1) is inferred to be ancestral, with a large red patch (see
Fig. 4). Establishment in
Mexico is thought to have resulted in fewer carotenoids in the diet, resulting
in a large pale patch as a phenotypically plastic response (2; see
Fig. 2). Subsequent selection
to increase patch brightness resulted in genetic evolution of small patch size
(3) as in the Mexican population (Fig.
4).
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